Synthesis and Characterization of the Y/MCM-41 Composite Molecular Sieves

Abstract:

The Y/MCM-41 composite molecular sieves were synthesized in the method of hydrothermal crystallization with cetyltrimethylammonium bromide (CTMABr) as the template agent. The as-prepared composite molecular sieves were characterized by the means of X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), the thermogravimetric and differential thermal analysis (TG-DTA) and the nitrogen adsorption test. The experimental results were shown as follows: the Y/MCM-41 composite molecular sieves kept properties of Y-zeolites and MCM-41 molecular sieves. In the XRD and FT-IR spectra, it can be found both characteristic peaks of Y-zeolites and MCM-41 molecular sieves. The pore size distribution plot indicated that the Y/MCM-41composite molecular sieves had micro-mesoporous structure, and the average pore size were about 1.5 nm and 15 nm. The decomposition temperature of the template agent was at 320 °C, and the calcined temperature of Y-zeolites was at about 560 °C. There showed an endothermic process constantly in the DTA curve, and there was little mass loss in the TG curve, indicating the obtained Y/MCM-41 composite molecular sieves had higher thermal stability.

• Periodical: Key Engineering Materials (Volumes 480-481)
• Pages: 159-164
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.480-481.159
• Online since: June 2011
• Authors: Li Qin Wang, Xiang Ni Yang, Yang Han, Ning Yu, Xiu Li Zhao
• Keywords: Characterization, Composite Molecular Sieves, Hydrothermal Synthesis, Micro-Mesoporous Structure, Y/MCM-41

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